where has the last acid rain ouccered

Answers

It isn’t really something that occurs in separate cases. It’s an ongoing problem. In fact, there’s probably someplace now that’s receiving acid rain. It simply mean that when the rain falls, it take some of the noxious gasses in the atmosphere down with it, turning the pH levels to less than a 7.0 balance. The link has more information on the exact process of acid rain.